<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script src="https://unpkg.com/vue@next"></script>
<div id="app">
    <div v-if="Math.random()>0.5">
        see, me
    </div>
    <div v-else>
        not see me
    </div>
</div>

<script>
    Vue.createApp({}).mount('#app');
</script>
</body>
</html>